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Body wave magnitude

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Title: Body wave magnitude  
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Subject: 1992 Cairo earthquake, 2009 Crete earthquake, 1976 Friuli earthquake, List of earthquakes in Hawaii, 1965 Olympia earthquake
Collection: Seismic Scales
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Body wave magnitude

Body wave magnitude (m_b) is a way of determining the size of an earthquake, using the amplitude of the initial P-wave to calculate the magnitude. The P-wave is a type of body wave that is capable of traveling through the earth at a velocity of around 5 to 8 km/s, and is the first wave from an earthquake to reach a seismometer. Because of this, calculating the body wave magnitude can be the quickest method of determining the size of an earthquake that is of a large distance from the seismometer.

Limitations in the calculation method mean that body wave magnitude saturates at around 6-6.5 m_b, with the figure staying the same even when the moment magnitude may be higher.

See also

External links

  • Measuring the Size of an Earthquake
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